Allocation of Frames

each process needs minimal number of pages
determined by 指令集的结构

fix-sized allocation

equal allocation

完全等分

proportional allocation

依据进程所占的空间大小，来按比例等分

priority allocation

use a proportional allocation scheme using priorities rather than size

如果遇到了page fault,可以选择

• local replacement 之前讲的都是局部置换！
• global replacement:replace the lower priority process's frame